all Factory Cabs are already MPT?

[Roby Rocks]

One question dear friends...

In Axe Edit from "preferences" panel I have read this:


so...
All the Factory Cabs (I don't use third part IR) are already Minimum Phase Transformed to prevent phase issues?

PS: I ask this, because when I use 2 cab, I always apply 20ms of "mic distance" to one of cab... to prevent phase issues...
but..... if the factory cabs are already "minimum phase transformed" that is not needed...

Thanks...

 

[toro484]

Yes they are. Here is a link to the wiki article where you can find this.

https://wiki.fractalaudio.com/axefx2/index.php?title=Cabinet_models_list

 

[Perdikament]

One question dear friends...

In Axe Edit from "preferences" panel I have read this:
View attachment 57025

so...
All the Factory Cabs (I don't use third part IR) are already Minimum Phase Transformed to prevent phase issues?

PS: I ask this, because when I use 2 cab, I always apply 20ms of "mic distance" to one of cab... to prevent phase issues...
but..... if the factory cabs are already "minimum phase transformed" that is not needed...

Thanks...

If you’re adding 20ms to only one cab and not the other to stock cabs you are introducing phase issues. I’m curious as to how you landed on 20ms as being the de facto amount though? Even when using non-MPT IR’s there is no magic/set/standard number when aligning multiple IR’s for phase.

 

[Roby Rocks]

If you’re adding 20ms to only one cab and not the other to stock cabs you are introducing phase issues.

I'm not sure..... I'm not the only one doing it...
from official wiki:

I’m curious as to how you landed on 20ms as being the de facto amount though? Even when using non-MPT IR’s there is no magic/set/standard number when aligning multiple IR’s for phase.

Simple... again from wiki:


http://wiki.fractalaudio.com/axefx2/index.php?title=Cab_block#Delay_.2F_Mic_Distance

 

[Dunconia]

What?! There’s a switch that makes them not MPT?!

 

[Perdikament]

I'm not sure..... I'm not the only one doing it...
from official wiki:
View attachment 57100


Simple... again from wiki:
View attachment 57101

http://wiki.fractalaudio.com/axefx2/index.php?title=Cab_block#Delay_.2F_Mic_Distance

Ahh, okay, I never read that before. I would personally suggest if you are going to do that, to not default to one set value for everything as each cab & speaker type is going to have their own frequency characteristics. And when you do that you’re canceling out certain frequencies, some of which you may find you like if you had it at say 16ms or 24ms. I personally never liked the sound of out of phase, to me it loses some punch.

 

[unix-guy]

The Axe Fx III Cab block has an Alignment control where you can see the IR response curve for each active IR and align them.

Also, note that the wiki mentions a .06ms delay... And it is intended to intentionally introduce, not avoid, phasing (comb filtering). Further, the intent on this case is to mimic different mic distances on the same speaker. So you want to do this with the same IR in multiple slots of your cab block for best results.

You say you are using 20ms... That's about 333 times more than suggested.

 

[Roby Rocks]

The Axe Fx III Cab block has an Alignment control where you can see the IR response curve for each active IR and align them.

Also, note that the wiki mentions a .06ms delay... And it is intended to intentionally introduce, not avoid, phasing (comb filtering). Further, the intent on this case is to mimic different mic distances on the same speaker. So you want to do this with the same IR in multiple slots of your cab block for best results.

You say you are using 20ms... That's about 333 times more than suggested.

Yeah. I said 20ms only for example. I apply 10ms, 20ms or 25/30ms... ...using my ears and my personal taste.
-close “off topic”-

1)are the Factory IR already minimum phase transformed?

2)And if I use a couple of the same IR?

3) so, the “smoothing” and “mic distance”’parameters are useless... ???

 

[unix-guy]

Yeah. I said 20ms only for example. I apply 10ms, 20ms or 25/30ms... ...using my ears and my personal taste.

Ok... Because that's not what you said:

I always apply 20ms of "mic distance" to one of cab... to prevent phase issues...

1)are the Factory IR already minimum phase transformed?

Yes. Already answered above

2)And if I use a couple of the same IR?

I'm not sure what you are asking...

3) so, the “smoothing” and “mic distance”’parameters are useless... ???

If they were useless, why would they exist?

Your post is confusing because you still seem to be under the impression that adding delay avoids phasing.

 

[Roby Rocks]

If the all Factory Cab are already MPT, can I use two IR without “smoothing” and “mic distance”????
And if I use a couple of the same IR????
Thanks.

 

[unix-guy]

If the all Factory Cab are already MPT, can I use two IR without “smoothing” and “mic distance”????
And if I use a couple of the same IR????
Thanks.

You can do whatever you want. But the whole point of MPT is to make sure that the IRs are all in-phase already.

 

[Joe Bfstplk]

I like to start with the large first bump on the left end of the impulse response lined up if using two IRs together and blending them to get a sound. This usually happens automagically with MPT IRs.

If the second of them is a "ROOM" sound IR, I generally place its large first bump on the left a tiny bit to the right of the main IR, and drop its level around 10-15dB (depends on the ROOM IR's sound) below the main mic's level. I usually shoot for the ROOM IR's peak being split by the descending trace from the main IR's peak. Seems to pretty reliably give me a little bit less "inside the monitors" and a little more "inside the room" vibe.